diff --git a/extensions/twitch/src/runtime-api.test.ts b/extensions/twitch/src/runtime-api.test.ts
new file mode 100644
index 00000000000..9ff6071ba01
--- /dev/null
+++ b/extensions/twitch/src/runtime-api.test.ts
@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+
+describe("twitch runtime-api", () => {
+  it("re-exports the runtime helpers used by Twitch internals", async () => {
+    const runtimeApi = await import("../runtime-api.js");
+
+    expect(runtimeApi.DEFAULT_ACCOUNT_ID).toBe("default");
+    expect(runtimeApi.MarkdownConfigSchema).toBeDefined();
+    expect(typeof runtimeApi.buildChannelConfigSchema).toBe("function");
+    expect(typeof runtimeApi.createReplyPrefixOptions).toBe("function");
+    expect(typeof runtimeApi.normalizeAccountId).toBe("function");
+  });
+});